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2 Biocybernetics and Biomedical Engineering

2 2008

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Suitability of new methods for pulseoximetric data analysis in screening diagnostics of Respiratory Disorders During Sleep (RDDS)

Hatliński G. J., Kowalski J. K., Kukwa A.

Biocybernetics and Biomedical Engineering

2008

Vol. 28, no. 3

27-33

Pulseoximetry is the simplest and the most reliable screening test for diagnosing of Respiratory Disorders During Sleep. Assessment of blood saturation with oxygen is a basic parameter to determine the degree of SAS (Sleep Apnea Syndrome) progression. The authors describe the conventional, but also their own newly developed methods for pulseoximetric data analysis, tested for over 4500 patients. The purpose of these new methods is to give physicians easier and more simple means for evaluating patients after all-night blood oxygen saturation monitoring. Inventiveness of this method lies in the possibility of examining of dynamics of blood oxygen saturation during patient's sleep. All received data are stored and can be reported in special 1-hour step intervals to facilitate comparative analysis of subsequent examinations and assess effectiveness of the treatment.

Application of tone-pip stimuli of different rise-times for wave V identification in auditory brainstem responses (ABR) procedures

Hatliński G. J., Kochanek K., Piłka A., Bochenek W.

Biocybernetics and Biomedical Engineering

2008

Vol. 28, no. 4

51-57

Application of tone-pip stimuli of elongated rise-times in examination of auditory brainstem responses (ABR TON) makes it possible to detect desynchronization of auditory nerve fibers in a much earlier stage of retrocochlear pathology than it would be possible when applying click-type acoustic stimuli. However, longer rise-time deteriorates synchronization of responses from individual nerve fibers. It makes the assessment of ABR morphology more difficult, in particular it hinders correct recognition of wave V. The quality of ABR recordings might be poor when examining retrocochlear pathologies, and/or in presence of excessive artifacts. The authors propose that, in the cases when accurate evaluation of wave V in ABRs recorded with the use of long-rise tone-pip stimuli (ABR TON, 4 or 8 cycles rise-time) is difficult, one should apply tone-pip stimuli of shortened rise-time (ABR TON-2, 2 cycles rise-time) to correctly identify wave V.